Question 9.SSE.9: Write the structure of alanine at pH = 2 and pH=10....
Write the structure of alanine at pH = 2 and pH=10.
Step-by-Step
Amino acids exists as zwitter ions (I) in aqueous solution. In presence of acid (pH = 2), the basic COO^- group accepts a proton to give cation (II) but in presence of a base (pH = 10), the acidic NH_3 group donates a proton to the base and thus exists as an anion (III).
\begin{matrix} && CH_3 &&&&&& CH_3 \\ && | &&&&&& |\\ \stackrel{+}{ N}H _3& – & C H & -& COO ^{-} & \stackrel{ H^+}{\longrightarrow} & NH _2 &-& CH &-& COOH \\ \text {Alanine ( I )} &&&&&&&& \text {II}\end{matrix}\begin{matrix} && CH_3 &&&&&& CH_3 \\ && | &&&&&& | \\ \stackrel{\oplus}{ N}H _3 &-& CH &-& COO ^{-} & \stackrel{ OH^-}{\longrightarrow} & H _2 N &-& CH &-& COO ^{-} \\ \text {Alanine ( I )} &&&&&&&& \text {III} \end{matrix}
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